Child support orders are designed to reflect a family's financial circumstances at the time they are entered. However, life can change significantly after a divorce or parentage case is finalized. A parent may lose a job, receive a promotion, experience health issues, or see changes in parenting time that affect the original support arrangement.



Under Illinois law, child support orders may be modified when certain legal requirements are met. A recent Illinois appellate court decision, In re Marriage of Vanduyne (June 2026), highlights the importance of following the proper legal process when seeking a modification.

If your financial situation or parenting arrangement has changed, understanding how Illinois courts evaluate child support modification requests may help you determine your next steps.

What Counts as a Significant Change?

Not every change will justify modifying child support. Generally, the court looks for a substantial change in circumstances before considering a modification.

Examples may include:

Changes in Income

A significant increase or decrease in either parent's income may affect child support calculations.

This could result from:

• Job loss
• Promotion
• Salary reduction
• Disability
• Retirement
• Self-employment income changes

Changes in Parenting Time

If the parenting schedule changes substantially, the number of overnights each parent has may affect child support calculations.

Changes to shared parenting arrangements may sometimes justify a review of an existing support order.

Employment Changes

A parent who changes careers, becomes unemployed, or returns to work after an extended absence may experience financial changes that affect support obligations.

Courts typically examine whether employment changes are temporary or long-term.

Medical Issues

Serious medical conditions affecting either a parent or the child may also influence child support.

Examples include:

• Long-term illness
• Disability
• Increased medical expenses
• Special healthcare needs
• Ongoing treatment costs

Every case is evaluated based on its own facts, and no single factor automatically guarantees a modification.

How Do Courts Review Modification Requests?

When reviewing a request to modify child support, Illinois courts generally consider the totality of the circumstances.

Depending on the case, the court may review:

• Each parent's current income
• Parenting time arrangements
• Childcare expenses
• Health insurance costs
• Educational expenses
• Medical needs of the child
• Other relevant financial information



The parent requesting the modification typically has the responsibility of showing that a substantial change has occurred.

Courts may also review updated financial documents and other evidence before deciding whether a modification is appropriate.

What Happens If Someone Stops Paying Child Support?

A parent should not stop paying child support simply because financial circumstances have changed.

Until the court approves a modification, the existing child support order remains in effect.

Failure to comply with a court order may result in enforcement actions, including:

• Collection of past-due support
• Wage garnishment
• Suspension of certain licenses
• Interest on unpaid child support
• Other legal remedies authorized under Illinois law



Parents experiencing financial hardship should consider requesting a modification as soon as possible rather than allowing unpaid support to accumulate.

Why Legal Guidance Matters in Child Support Modification Cases

Child support modification cases often involve changing financial circumstances, updated parenting schedules, and evolving family needs.

An experienced Illinois family law attorney can help evaluate whether a substantial change in circumstances may support a modification request and guide parents through the legal process.

Whether you are seeking to increase, reduce, or review an existing child support order, understanding your legal rights is an important first step.

If you have questions about child support, parenting time, or modifying a child support order in Illinois, the family law team at Weiss Ortiz Attorneys & Mediators can help you understand your legal options.